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Buildings and property

Popular pages

Green and sustainable building

Resources for developers, builders, architects, and homeowners interested to build toward a sustainable King County.

Historic preservation

Learn about the Historic Preservation Program and its efforts to preserve the history of King County.

Property research and maps

Learn more about landslide mapping and property specific development conditions, or access reference maps for planning support.

Property tax assessments

Learn more about how we assess and tax residential property.

Property tax payments

After King County issues a building permit, inspections are required at different stages of the project.

Additional links

Buying and Selling TDRs

Describes how the trading of TDRs works in the private TDR market with link to the TDR Exchange.

Transfer of Development Rights Exchange

The Transfer of Development Rights Exchange facilitates the trading of Transferable Development Rights. This page describes how it works and how to register on the Exchange.

Alpental / Skykomish - Area 90

View and download PDF reports from the assessor of Area 90's current valuation. Also, find important links for the area.

Area reports - King County Assessor

These reports are a resource for property tax information across King County for a selected year.

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